On Jan 12, 12:11 am, Mark Fredrickson <[email protected]>
wrote:
> I can't imagine this idea will be met warmly, but I have a suggestion.
> It requires ending maps and vectors as functions of keys. Instead,
> make the first argument to a collection be a function which is mapped
> to across the collection. Any additional arguments are passed to the
> function on each invocation. For maps and hashes, this would only be
> applied to the values. Keys would remain the same.
>
> Some examples:
> ('(1 2 3) * 2) => (2 4 6)
> ({:greet "hello" :farewell "goodbye"} str " Mark") => {:greet "hello
> Mark" :farewell "goodbye Mark"}
Hi Mark,
I find the callable map VERY useful, and would hate to lose it. You
can use maps for lots of things besides keyword=>value structures, and
the callable map becomes more valuable in those situations.
Your first example can be written almost as succinctly with map:
(map #(* % 2) '(1 2 3))
;;=> (2 4 6)
The second is a little more complicated, but still doable:
(reduce (fn [m [k v]] (assoc m k (str v " Mark")))
{} {:greet "hello" :farewell "goodbye"})
;;=> {:farewell "goodbye Mark", :greet "hello Mark"}
-Stuart Sierra
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